反应详情

(R)-methyl 2-(5-(2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidin-3-ylamino)-2-oxoacetate (Example 104; 100 mg, 0.249 mmol) was dissolved in a mixture solvent of THF:MeOH:water (2:2:1, 1 mL), followed by addition of LiOH—H2O (31.4 mg, 0.747 mmol). The reaction was stirred at ambient temperature for 10 minutes to reach completion. The reaction was concentrated, re-dissolved in water (20 mL) and acidified with 6 N HCl. The precipitate was vacuum-filtered, rinsed with water, heptane, and dried on high vacuum, giving the final product as a fine pale-yellowish powder (50 mg, 52% yield). MS (apci negative) m/z=386.1 (M−H).

1. concentrationThe reaction was concentrated
2. dissolutionre-dissolved in water (20 mL)
3. filtrationThe precipitate was vacuum-filtered
4. washrinsed with water, heptane
5. customdried on high vacuum